Radiation astronomy/Subatomics/Quiz

Subatomic astronomy is a lecture and an article from the astronomy department. It is under development for possible inclusion in the course on the principles of radiation astronomy.

This is an image obtained from muon radiography of Japan's Asama volcano. Credit: H T M Tanaka.

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1 True or False, An antimuon is a muon spinning backward in time.


2 Complete the text:

Bombardment by protostellar

may make the rock

of calcium-aluminum-rich inclusions

and chondrules radioactive, producing

found in meteorites that are difficult to obtain with other mechanisms.

3 True or False, Like all elementary particles, the meson has a corresponding antiparticle of opposite spin but equal mass and charge.


4 Ionization within the Earth's atmosphere from cosmic rays has what property?

it's subject to solar eclipses
it increases underwater
cosmic rays do not penetrate the atmosphere
is higher at the base of the Eiffel tower rather than the top
is obscured by hot-air balloons
the ionization rate rises at rising elevation

5 True or False, The radius of the proton is 4 percent smaller than previously estimated.


6 Which of the following are associated with the IceCube Neutrino Observatory?

under ice
the Amundsen-Scott South Pole Station
Digital Optical Modules
the counting house is on the surface above the array
the baryon neutrino
the electron neutrino

7 True or False, In the sky as seen by AMANDA-II the downgoing atmospheric muon background is responsible for the thick band of events below the horizon.


8 What negatively charged particles may be used as tracers of cosmic magnetic fields?

9 Complete the text:

Charged-current charged pion production is a process in which a

interacts with an atomic

and produces a

, a charged

and recoiling nuclear fragments.

10 TeV muons from gamma-ray primaries are rare because?

only produced by higher energy gamma rays
suppressed gamma-ray flux
decreasing flux at the source
GeV gamma rays
interstellar light

11 True or False, Due to the limited shielding provided by its relatively weak magnetic dipole moment, the surface of Mercury is everywhere subject to bombardment by cosmic rays.


12 Which of the following are associated with electromagnetics?

angular momentum transfer
solar wind
the baryon neutrino
charge neutralization

13 Complete the text:

The nuclear processes that produce cosmogenic 36Cl in rocks are

, neutron

, and


14 True or False, Van Allen radiation belt electrons are constantly removed by collisions with atmospheric neutrals, losses to the magnetopause, and outward radial diffusion.


15 What are some of the characteristics of Jovian electrons?

hard spectrum
Jovian electrons near Earth are on their way to the Sun
an energy power law
flux increases with 27 day periodicities
at 1 AU, flux decreases exhibit a short-term modulation of 13 minutes
come in mutable varieties

16 Which of the following is not characteristic of a neutrino?

neutrinos are affected by the weak nuclear force
produced by a positron annihilating an electron
a decay product of a neutron
produced by the near surface fusion on the Sun
may have a mass
comes in mutable varieties

17 Complete the text:

Match up the item letter with each of the possibilities below:
Meteors - A
Cosmic rays - B
Neutrons - C
Protons - D
Electrons - E
Positrons - F
Gamma rays - G
Superluminals - H
X-ray jets

the index of refraction is often greater than 1 just below a resonance frequency

iron, nickel, cobalt, and traces of iridium

Sagittarius X-1

escape from a typical hard low-mass X-ray binary

collisions with argon atoms

X-rays are emitted as they slow down

Henry Moseley using X-ray spectra


18 A cosmic ray may originate from what astronomical source?

the solar wind
the diffuse X-ray background
Mount Redoubt in Alaska
the asteroid belt
an active galactic nucleus

19 The relative abundances of solar cosmic rays reflect those of the solar

20 Complete the text:

Cosmic rays with energies over the

energy of 5 x 1019

interact with

photons to produce

via the   resonance.

21 True or False, Mesons inherit the high energy of the parent cosmic rays.


22 Complete the text:

Muons are produced, along with other particles, when

interact with

in the Earth's atmosphere to produce

of secondary particles.

23 Which of the following are associated with muon astronomy?

high-energy cosmic rays
secondary and tertiary cosmic rays
nuclear interactions between neutrons and quartz
nuclear interactions between muons and calcite
production rates of a few atoms per gram of rock per year
build-up of cosmogenic nuclides through time


  1. Subatomics astronomy should help determine where in the solar octant neutrinos are being generated.

See alsoEdit

External linksEdit